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Shop Supplies - Locks - Master Lock


Master Lock Pro Series Solid Iron Shroud Locks
Click Here for more information or to order
Greatest physical security available.


  • Defeats attemps to pry and cut.
  • Heavy steeel bodies.
  • Hardened steel and boron alloy shackles for superior cut resistance.
  • Dual dead bolt locking for extreme resistance to prying.


Greatest key security available:

  • 5-Pin tumbler Pro Series® cylinders provide tens of thousands of key changes.
  • Special spool pin tumblers are virtually impossible to pick.
  • Proprietary rustproofing for longer life.
  • Rekeyable - replaceable cylinder and shackle.





Master Lock Resettable Combination Locks
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  • 2" Wide solid brass case.
  • Use combination reset feature to restrict/change allowed access.
  • Reset to any of 10,000 numbers.
  • 4-Digit direct dial operation.
  • 2" Wide solid brass case for strength and weatherablility.
  • Heavy hardened shackle provides high resistance to cutting and prying.
Greatest physical security available.


  • Defeats attemps to pry and cut.
  • Heavy steeel bodies.
  • Hardened steel and boron alloy shackles for superior cut resistance.
  • Dual dead bolt locking for extreme resistance to prying.


Greatest key security available:

  • 5-Pin tumbler Pro Series® cylinders provide tens of thousands of key changes.
  • Special spool pin tumblers are virtually impossible to pick.
  • Proprietary rustproofing for longer life.
  • Rekeyable - replaceable cylinder and shackle.





Master Lock Safety Lockout High Visibility Aluminum Locks
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  • Available in six vibrant colors for easy lockout customization.
  • Bake-on powder-coated finish stays bright.
  • Ideal for corrosive and tough environments.
  • Tens of thousands of key changes available.
  • Rekeyable bodies for easy key system maintenance.
  • Hardened shackles for superior resistance to cutting.
  • Laser engraving service available.
  • Width: 1-9/16".
  • Shackle dimensions: A: 1/4", B: 1-1/16" and C: 25/32".
Greatest physical security available.


  • Defeats attemps to pry and cut.
  • Heavy steeel bodies.
  • Hardened steel and boron alloy shackles for superior cut resistance.
  • Dual dead bolt locking for extreme resistance to prying.


Greatest key security available:

  • 5-Pin tumbler Pro Series® cylinders provide tens of thousands of key changes.
  • Special spool pin tumblers are virtually impossible to pick.
  • Proprietary rustproofing for longer life.
  • Rekeyable - replaceable cylinder and shackle.





Master Lock Safety Lockout Steel Body Locks
Click Here for more information or to order
  • Reinforced laminated steel construction.
  • Ideal when locks may be subjected to physical abuse.
  • Six available bumper colors for segmentation by department, etc.- Red,Green,Yellow, White, Black, Blue. Specify color when ordering.
  • Complete range of 4-pin tumbler cylinder (1,400 key changes) is available.
  • Width: 1-1/2".
  • Shackle dimensions: A: 9/32", B: 1-1/2" and C: 5/8".
Greatest physical security available.


  • Defeats attemps to pry and cut.
  • Heavy steeel bodies.
  • Hardened steel and boron alloy shackles for superior cut resistance.
  • Dual dead bolt locking for extreme resistance to prying.


Greatest key security available:

  • 5-Pin tumbler Pro Series® cylinders provide tens of thousands of key changes.
  • Special spool pin tumblers are virtually impossible to pick.
  • Proprietary rustproofing for longer life.
  • Rekeyable - replaceable cylinder and shackle.






Servicing Industry Since 1968

Have a Question or Need Technical Assistance? For Personal Service Click Here to contact a NSS dealer for your state.